Electric tool



R. L. HINDS ELECTRIC TOOL June lG, 1931.

Filed Dec. 21, 1928 r N 5 I Pateted !une 16, 1931 .UNITED STATES iROBERT L. EINDB, OF TOLEDO, OEIO minerare 'mon Application filedDecember 21, 1928. Serial No. 327531.

This invention relates to tools for acting on'metal. y i

This' inventio has utility when incorporated in a transformer housingterminal,

U with a plurality of flexible extensions therefrom in providingadditional terminals.

Referrng to the drawings:

Fig. 1 is a perspective vew of an embodiment of the invention;

Fig. 2 is a fragmentary plan view, with the cover removed, of thehousing of Fig. 1, portions being broken away;

Fig. 3 is a longitudinal section through the housing of Fig. 1; r e

Fig. 4 is a side elevation of the housing of F ig. 1, showing extensionterminals assembled therefrom; and

Fig. 5 is a wiring diagram.

Housing 1 as herein adopted is preferably of a non-magnetic metal asaluminun. This housing or box 1 has top plate or cover 2 of magneticmaterial as iron having in transverse slots 3 thereof filling 4 ofnon-magnetic material as aluminum. There is accordingly thus completedthe housing. Electric current supply line 5, say for alternating currentof 110 volts extends to the housing. Externally of the housing there ismounted switch 6 in association with fuse 7 carried by insulator block8. Inside this housing 1 is core device of laminations of sheet ironhaving central pole 9 and terminal poles 10. This core member isinsulated from the housin 1 by fiber board 11. Taps 12 in the undersi eof the cover plate 2 are in alignment with openings 13 in the bottom ofthe housing 1 so that stud bolts 14 may be engaged with the top 2 andnuts 15 be effective for thereby drawing the top 2 into fiush positionwith the housing and into direct contact with the pole pieces 9, 10. Asthus assembled, cover nuts 15' as legs or feet may be applied to concealthese nuts 15.

Central pole 9'carries primary winding 16 of many coils of fine wire inthe instance when 110 volts alternating current 60 cycle is used,and'secondary winding 17 of a few turns of coarse wire. There is thusprovided a transformer. The secondary may be to no purpose in theinstance the tool is to be used as a demagnetizer, wherein the materialto be thus treated may be shifted along the top 2 from end to end toclear such top, while the alternating current is creating pulsatingmagnetic fields.

The primary winding 16 is connected to the supply line 5. The secondarywindin 17 is provided with extension IBbranche to provide terminals 19,20. The terminal 19 is shown as a threaded stem anchored with the topplate 2. The terminal 20 is an internally threaded socket havinginsulation 21 from the housing 1.

Flexible extension 22 may have screw thread stem 23 engaging the socketterminal 20 in thereby providing conductor connection to spring clampterminal 24 thus permitting such connection to be made away from thehousing l The secondary windin g 17 may have its other extension 25therefrom connected to terminal 26 as an internally threaded socket toreceive externally thread- 'ed connection 23 of flexible extension 27 tohand piece 28 having thread connection for mounting terminal 29, hereinshown as a metallic point say of copper.

In the use of this terminal, relatively low voltage may be adopted, andwith the current completed through work 30, as placed upon the plate 2,there may be direct mar-king on such work by the action of such lowvoltage relatively high ampere current, effecting arcing out ofimpurities in the material in the line of travel of the point in thewriting operation. This writing operation is more satisfactorilyaccomplished by very light touch. If there be a more firm bearng down,.the connection is a really good conducting short circuit and does notgive the marking I efl'ect on the metal. The materials as markedhereunder may be iron or steel or other metals. The more impure thespecimen and greater electrical resistance the material has, the moreeasy the marking. -Successful marking is obtained even on copper andaluminun.

Line 31 from the terminal 20 extends to supplemental secondary windings32, 33, on the terminal poles'lO of the laminated core structure. Fromthese windings 32, 33, of the secondary winding, extends connection 34to terminal 35 as an internally threaded socket, insulated from thehousing 1. These' additional second windings tend to reduce the amperes,but increase the voltage for the secondary winding, 32, 33, in theinstance that the externally threaded fitting 23 is assenbled in theterminal 35 instead of the terminal 26. With such higher voltage, thehandle 28 may be used with a higher resistance terminal. To'this end,extension 36 is provided for thread assemhly with the handle 28. Thisfitting 36 is provided with an eye having set screw 37 for clampingtherein carbon electrode. 38. Accordingly, in this assemblv, the carbonelectrode may be used for marking on work 30 as on the housing. or work39 as engaged by the terminal 24. Furthermore. there may be performedsuch cutting, soldering and light annealing operations as may be founddesirahle or even to filling in places on work or castings.

There is accordingly provided under the disclosure herein, a simplecompact tool including a transformer housing in a demagnetizer case,whichsdemagnetizer may be a terminal or merely the housing and that fromsuch there may be the supplemental terminals for one or both of theterminals of the .secondary as in Simpler form or for the secondary assupplemental for the higher voltage.

It is to be understood the marker is more satisfactorily effective whenthe pencil is of dissimilar substance from the Work. If the pencil be ofless resistance than the work, the marking line -may be more fine andclear.

With 110 volt, 60 cycle current, the prinary winding and transformer mayconveniently be of say 550 turns of No. 20 wire, and the secondary coilsbe of say 8 or 9 turns of No. 6 wire.

What is claimed and it is desired to secure by Letters Patent is:

1. transformer housing having a conductor face, a transformer thereinhaving primary and secondary windings, electric current supplyconnections to the transformer, a branched connection at one side of thetransformer from the secondary winding extending as to one branchthereof to the housing conductor face, and a flexible extension from theother branch thereof having a terminal for connection away from theho'sing. p

2. A transformer housing having a conductor face, a transformer thereinhaving primary and secondary windings, electric current supplyconnections to the transform- `er, a branched connection at one side ofthe transformer from the' secondary winding extending as to one branchthereof to the housing conductor face, and a flexible extension from theother branch thereof having a terminal for connection away from thehousing, said secondary winding having a second terminal insulated fromthe housing, and a second flexible extension from the second terminel.

3. A transformer housing having a. conductor face, a. transformertherein having primary and secondary windings, electric current supplyconnections to the transfoi'mer, a branched connection at one' side ofthe transformer from the seoondary winding extending as to one branchthereof to the housing conductor face, and a flexible extension from theother branch thereof having a terminal for connection away from thehousing, said secondary winding having second and third terminalsinsulated from the housing, and a second flexible extension selectivel-yconnectible to said nsulated terminals.

4. A transformer housing having a conductor face, a transformer thereinhaving primary and secondary windings, electric current supplyconnections to the transformer, a branched connection at one side of thetransformer from the secondary winding extending as to one branchthereof to the housing conductor face, said secondary winding havingsecond and third terminals insulated from the housing, one of saidinsulated terminals being from the other branch of said connection, anda flexible extension selectively connectible to said insulatedterminals.

In witness whereof I aflix my signature.

ROBERT L. HINDS.

